state the laws of refraction of light . explain the term 'absolute refractive index of a medium 'and write an expression to relate it with the speed of light in vacuum.
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Refraction is the phenomenon in which direction of propagation of light changes when it passes from one transparent medium to another. This is because the speed of light is different in different media.
The following are the two laws of refraction:-
1. The incident ray, the refracted ray and the normal at the point of incidence, all lie in the same plane.
2. the ratio of sin of angle of incidence to sin of angle of refraction is a constant for the light for given colour and given pair of media. this is known as snell's law of refraction.
the absolute refractive index is defined as the ratio of speed of light in air or vacuum to the speed of light in the medium.
The following are the two laws of refraction:-
1. The incident ray, the refracted ray and the normal at the point of incidence, all lie in the same plane.
2. the ratio of sin of angle of incidence to sin of angle of refraction is a constant for the light for given colour and given pair of media. this is known as snell's law of refraction.
the absolute refractive index is defined as the ratio of speed of light in air or vacuum to the speed of light in the medium.
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